bodington-developers

[Bodington-developers] IMS CP, Xerces and the vital asterisk

[Peter C. <Pet...@me...>]

Found the glitch, after considerable experimentation.  Different
versions of Xerces appear to treat a wildcard ("*") namespaceURI in
ElementImpl::getAttributeNS() differently.  This means that code that
successfully located <imsmd:langstring imsmd:lang=3D"en"> and =
<langstring
lang=3D"en"> in the version of the parser in which I developed the CP
extensions does not work with newer Xerces versions.

Anyone know of a portable way of wildcarding the namespace URI?

		- Peter

Re: [Bodington-developers] IMS CP, Xerces and the vital asterisk

[Matthew B. <mat...@ou...>]

Peter Crowther wrote:
> Found the glitch, after considerable experimentation.  Different
> versions of Xerces appear to treat a wildcard ("*") namespaceURI in
> ElementImpl::getAttributeNS() differently.  This means that code that
> successfully located <imsmd:langstring imsmd:lang="en"> and <langstring
> lang="en"> in the version of the parser in which I developed the CP
> extensions does not work with newer Xerces versions.
> 
> Anyone know of a portable way of wildcarding the namespace URI?

Can you pass it NULL as the namespace?

-- 
  -- Matthew Buckett, VLE Developer
  -- Learning Technologies Group, Oxford University Computing Services
  -- Tel: +44 (0)1865 283660 http://www.oucs.ox.ac.uk/ltg/

Re: [Bodington-developers] IMS CP, Xerces and the vital asterisk

[Matthew B. <mat...@ou...>]

Peter Crowther wrote:
> Found the glitch, after considerable experimentation.  Different
> versions of Xerces appear to treat a wildcard ("*") namespaceURI in
> ElementImpl::getAttributeNS() differently.  This means that code that
> successfully located <imsmd:langstring imsmd:lang="en"> and <langstring
> lang="en"> in the version of the parser in which I developed the CP
> extensions does not work with newer Xerces versions.

Do you have the version numbers between which this changed?

-- 
  -- Matthew Buckett, VLE Developer
  -- Learning Technologies Group, Oxford University Computing Services
  -- Tel: +44 (0)1865 283660 http://www.oucs.ox.ac.uk/ltg/

Re: [Bodington-developers] IMS CP, Xerces and the vital asterisk

[Matthew B. <mat...@ou...>]

Peter Crowther wrote:
> Found the glitch, after considerable experimentation.  Different
> versions of Xerces appear to treat a wildcard ("*") namespaceURI in
> ElementImpl::getAttributeNS() differently.  This means that code that
> successfully located <imsmd:langstring imsmd:lang="en"> and <langstring
> lang="en"> in the version of the parser in which I developed the CP
> extensions does not work with newer Xerces versions.
> 
> Anyone know of a portable way of wildcarding the namespace URI?

Actually thinking about this would it make any sense? getAttributeNS() 
returns a String and so what happens when the XML is:

<langstring lang="en" xml:lang="en-US"/>

Which attribute value should it return? The reason you have to specify a 
namespace and can't wildcard is so that you can only ever have one value 
returned as this isn't valid XML:

<langstring lang="en" lang="en-US"/>

I think the only real solution is to call it multiple times with the 
namespaces expected.

-- 
  -- Matthew Buckett, VLE Developer
  -- Learning Technologies Group, Oxford University Computing Services
  -- Tel: +44 (0)1865 283660 http://www.oucs.ox.ac.uk/ltg/